JP2006258453A - Encoder device, its parameter destruction self resetting device and parameter destruction self resetting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an encoder device and its parameter destruction self resetting device and method for the same capable of recovering the parameter destruction caused by generated by malfunction of asoftware and capable of preventing a needless system stop without a countermeasure against the erroneous operation of an external memory device at the hardware side. <P>SOLUTION: The parameter destruction self resetting method is provided with a microcomputer 2 and external memory device 1, in which the microcomputer 2 is provided with the RAM part 3 for temporally storing the data read from the external memory device, and the backup part 6 for storing the backup of the external memory device 1. When the destruction of recorded information is detected, the information recorded in the external memory device 1 processes with the procedure for self resetting. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an encoder device that detects the amount of rotation of a rotating body and the amount of movement of a moving body, its parameter destruction self-recovery device, and a parameter destruction self-recovery method.

Conventionally, an encoder device that detects the amount of rotation of a rotating body and the amount of movement of a moving body includes parameters (such as ID as identification information for each product, unique information for operation, alarm detection target information, etc. at the time of manufacture and shipment). A nonvolatile memory such as an EEPROM for storing (internal data) is mounted (see, for example, Patent Document 1).
The parameter storage EEPROM installed in such an encoder device may be vulnerable to fluctuations in the power supply. When an irregular power supply is applied, internal data may be destroyed and the system configuration may become inoperable. It was.
As a measure to prevent parameter destruction of the encoder device, when the power is indeterminate in the input / output terminal section and the chip select signal terminal section that controls the operation of the external memory device on the hardware side, In order to prevent the output level from becoming unstable, there is a circuit in which the signal level at each terminal is ensured by connecting to a reference potential via a pull-down resistor.
FIG. 3 is a block diagram showing the configuration of the microcomputer and the external memory device of the encoder apparatus to which the method of the prior art is applied.
In FIG. 3, E is an encoder device, 1 is an external memory device, 2 is a microcomputer, 3 is a RAM section, and 4 is a program section.
The external memory device 1 stores specific information for operating the encoder, identification information, and the like, and its input / output is input to an input / output port of the microcomputer 2 via a control data line as shown in FIG. It is connected. The microcomputer 2 includes a program unit 4 necessary for the operation of the encoder, and a RAM unit 3 for reading out data stored from the external memory device 1 and temporarily storing the data.
In such a configuration, the pull-down resistor 5 having an appropriate value is connected to the reference potential at the chip select signal terminal of the external memory device 1, and the L level is reliably applied even when the power source is indeterminate. However, this prevents malfunctions in hardware, that is, prevents data stored inside from being destroyed.
As described above, in the above encoder, the level of the input / output terminal is applied on the hardware side without being affected by the circuit state so that the internal memory data is not destroyed by the malfunction of the external memory device 1. By doing so, a procedure was taken to prevent malfunction, that is, parameter destruction.
Japanese Patent No. 3130069

However, in the parameter destruction prevention method performed on the hardware side in the prior art, a configuration in which a pull-down resistor is added to the input / output terminals prevents the encoder body from being downsized due to an increase in the number of components, and is expensive. was there.
In addition, due to the nature of the semiconductor memory, depending on the condition of the voltage applied to the encoder, there is also a problem that parameter destruction cannot be completely prevented only by measures taken on the hardware side.
The present invention has been made in view of such problems, and it is possible to self-recover parameter destruction caused by malfunction in software without taking measures to prevent malfunction of the external memory device on the hardware side. An object of the present invention is to provide an encoder device, a parameter destruction self-recovery device, and a parameter destruction self-recovery method that can prevent an unnecessary system stop.

In order to solve the above problem, the present invention is as follows.
The invention according to claim 1 is an encoder device that detects the amount of rotation of a rotating body and the amount of movement of a moving body, an external memory device that stores unique information or identification information for operating the encoder, and the external device A microcomputer connected to an input / output unit of the memory device via a control data line, and the microcomputer stores a program unit necessary for the encoder to operate and stores from the external memory device It is characterized by comprising a RAM part for reading out and temporarily storing the stored data and a backup part for storing a backup of the external memory device.

  The invention according to claim 2 relates to a parameter destruction self-recovery device for an encoder device, and is an inherent feature for operating an encoder in an encoder device that detects the amount of rotation of a rotating body and the amount of movement of a moving body. A RAM unit in the microcomputer in which data is read from an external memory device for storing information or identification information and the data read from the external memory device is connected to an input / output unit of the external memory device Means for temporarily storing data, means for cumulatively adding the data read this time to the collation data to be subjected to data collation processing, and updating the result as collation data, and whether all areas of the external memory device have been read And when the entire area of the external memory device is read out, A means for determining whether the collation data matches a specified value provided in the microcomputer and defined on a program unit required for the operation of the encoder; and from the external memory device Using the collation data calculated from the read data and the prescribed value prescribed by the microcomputer, the value obtained by subtracting the matching data from the prescribed value is defined as the original value discarded, and Means for detecting the presence or absence of destruction of information recorded in the external memory device, data in a backup unit provided in the microcomputer and storing a backup of the external memory device, and data in a RAM unit in the microcomputer Means for comparing the data in the backup unit and the data in the RAM unit The read information to write processing at the encoder itself in the external memory device, characterized by comprising means for the information recorded in the external memory device is self-resetting, the.

  The invention according to claim 3 relates to a parameter destruction self-recovery method of an encoder device, and is an inherent feature for operating an encoder in an encoder device that detects the amount of rotation of a rotating body and the amount of movement of a moving body. A RAM unit in a microcomputer connected between the step of reading data from an external memory device for storing information or identification information, and the data read from the external memory device between the input / output unit of the external memory device A step of temporarily storing the data, a step of accumulating the data read this time to the collation data to be subjected to data collation processing, and updating the result as collation data, and whether or not all areas of the external memory device have been read Determining whether or not all areas of the external memory device have been read Determining whether the accumulated collation data matches a specified value provided in the microcomputer and required for the operation of the encoder. The collation data calculated from the data read from the external memory device and the prescribed value prescribed by the microcomputer are used to subtract the value obtained by subtracting the matching data from the prescribed value. And detecting whether or not the information recorded in the external memory device is destroyed, data in a backup unit provided in the microcomputer and storing a backup of the external memory device, and the microcomputer A step of reading out the data of the RAM part in the internal memory, the data of the backup part, and the R A step of comparing the data in the M section, and a step of writing the read information into the external memory device by the encoder itself so as to self-recover the information recorded in the external memory device. It is characterized by.

  According to the first aspect of the present invention, when the data stored in the external memory device is destroyed, the destruction location and the recovery can be reliably performed by using the backup data stored in the microcomputer and comparing the two. The data that should be obtained can be obtained, and the authenticity of the backup data can also be confirmed.

  Furthermore, according to the inventions of claims 2 and 3, by rewriting data to be restored to the destruction location by the encoder device itself, data destruction can be prevented without taking measures against data destruction on the hardware side. Can do.

  Embodiments of the present invention will be specifically described below with reference to the drawings. Note that the description of the same constituent elements of the present invention as those of the prior art will be omitted, and different points will be described.

FIG. 1 is a block diagram showing the configuration of a microcomputer and an external memory device of an encoder apparatus that implements the method of the present invention.
In FIG. 1, 6 is a backup unit.
The present invention is different from the prior art as follows.
That is, the microcomputer 2 is provided with a backup unit 6 for recording a backup of data stored in the external memory device 1 in addition to the RAM unit 3 and the program unit 4.

Data for operating the encoder is read from the external memory device 1 when the power is turned on. When reading, when the data becomes abnormal in the read path due to disturbance noise etc. at the time of reading and because the external memory device is a semiconductor device, there is a possibility that it has been rewritten to unexpected data due to internal malfunction. As a data consistency check, for example, the sum of all read data is obtained, and if the result is a certain value (for example, the sum of the read data becomes 0), the read is successful or the stored data is abnormal. Judge that there is no. Thereafter, the data is stored in the RAM unit 3 of the microcomputer 2, and the encoder can perform a prescribed operation using the data stored in the RAM unit 3.
In the data consistency check, if consistency is not achieved for some reason, using the data stored in the external memory device as it is may cause an adverse effect on the operation of the encoder. The alarm data is reported to the outside in the form of an alarm output.

The operation will be described with reference to the flowchart of FIG.
First, data is read from the external memory device 1 in step ST1. Since the data size at the time of reading varies depending on the specifications of the external memory device to be mounted, reading is performed with a size that meets the specifications.

  In step ST2, the data read in step ST1 is stored in the RAM unit 3 in the microcomputer 2.

  In step ST3, as the data collation process, the data read this time is added to the collation data, and the result is updated to the collation data. Here, the collation data indicates a value obtained by accumulating the read data.

  In step ST4, it is determined whether or not all areas of the external memory device 1 have been read. If all the areas have not been read, the process returns to step ST1, and the series of reading, collation data calculation, and all area reading determination are repeated until all the areas of the external memory device 1 are read. When all the areas have been read, the process proceeds to the next step ST5, where it is determined whether the collation data accumulated in the calculation of step ST3 matches the collation value defined in the program. Here, the collation values specified in the program are such that the result of adding all the read values becomes a specific value regardless of what data is stored in the external memory device 1. Need to be. If the collation data calculated from the data read from the external memory device 1 matches the collation value defined by the microcomputer 2 in the determination of step ST5, the data reading from the external memory device 1 is completed correctly. In addition, assuming that correct data is stored, this processing is terminated. If the collation data and the value do not match, it is determined that reading from the external memory device 1 has failed, or any of the stored data in the external memory device 1 has been destroyed, Move on to step ST6.

  After step ST6, data recovery of the abnormal external memory device 1 is performed. In step ST6, in order to recover the data, the original value of the destroyed data stored in the external memory device 1 using the collation data obtained in step ST5 and the value defined by the microcomputer 2 is used. Ask for. The original value is obtained as the original value of the destroyed data by subtracting the collation data obtained in step ST5 from the data defined by the microcomputer 2.

  Next, in step ST7, the data in the backup unit 6 in the microcomputer 2 and the data in the RAM unit 3 in the microcomputer 2 stored in step ST2 are read.

  In step ST8, the data read in step ST6 are compared. If the respective data match, the data stored in the RAM unit 3 in the microcomputer 2 is assumed to be correct, and the process proceeds to step ST12. If the data do not match, it is determined that there is a high possibility that the data at the address is destroyed, and the process proceeds to step ST9.

  In step ST9, first, the original value stored in the external memory device 1 obtained in step ST5 is compared with the data of the backup unit 6 in the microcomputer 2. If they match, the process moves to step ST10, and the original value obtained in step ST5 is written in the corresponding address of the external memory device 1. If they do not match, it is determined that there is a possibility of destruction not only at address 1 but also at a plurality of addresses, and the process moves to step ST11.

  In step ST11, for the purpose of confirming the data authenticity of the backup unit 6 mounted on the microcomputer 2, the verification data obtained in step ST5 is obtained from the data stored in the backup unit 6 in the microcomputer 2. Subtraction is performed, the result is held as a temporary true value, and the process returns to step ST9. Then, the provisional true value obtained in step ST11 is compared with the backup value. If they match, the process proceeds to step ST10. If they do not match, this operation is repeated, and even if data corruption occurs at multiple addresses, it is possible to calculate the true value for each address, and as a result, it is possible to reliably restore data corruption .

  After writing the true data to the external memory device in step ST10, it is determined in step ST12 whether all areas of the backup unit 6 in the microcomputer 2 have been checked, and if all areas have been checked. This process is terminated, and if not checked, the process returns to step ST7 again, and a series of data recovery processes are repeated.

  By carrying out this series of processing, even if the data stored in the external memory device 1 is destroyed due to some reason, the data destruction address is specified using the data of the backup unit 6 in the microcomputer 2. By using the accumulated read data calculated for data collation and the data defined by the microcomputer 2, the true data at the address where the data destruction has occurred can be obtained. By writing the required true data to the location where the data destruction occurred, it is possible to recover from the data destruction even if there is no data destruction prevention measure by hardware.

The block diagram which shows the structure of the microcomputer of the encoder which applies the method of this invention, and an external memory device The flowchart which shows the process sequence of the 1st method of this invention. Block diagram showing the configuration of the microcomputer and the external memory device of the encoder apparatus to which the conventional method is applied

Explanation of symbols

1 External memory device 2 Microcomputer 3 RAM section 4 Program section 5 Pull-down resistor 6 Backup storage section

Claims (3)

In the encoder device (E) for detecting the amount of rotation of the rotating body and the amount of movement of the moving body,
A microcomputer connected via a control data line between an external memory device (1) storing unique information or identification information for operating the encoder and the input / output unit of the external memory device (1) (2)
The microcomputer (2) includes a program unit (4) necessary for the operation of the encoder and a RAM unit (for reading and storing data stored from the external memory device (1)). 3) An encoder apparatus comprising: a backup unit (6) for storing a backup of the external memory device (1). In the encoder device (E) for detecting the amount of rotation of the rotating body and the amount of movement of the moving body,
Means (ST1) for reading data from an external memory device (1) for storing unique information or identification information for operating the encoder;
Means for temporarily storing data read from the external memory device (1) in a RAM unit (3) in a microcomputer (2) connected to the input / output unit of the external memory device (1) ( ST2)
Means (ST3) for accumulatively adding the data read this time to the collation data to be subjected to data collation processing and updating the result as collation data;
Means (ST4) for determining whether or not all areas of the external memory device (1) have been read;
When the entire area of the external memory device (1) is read out, the accumulated collation data and a program unit (4) provided in the microcomputer (2) and necessary for the operation of the encoder Means (ST5) for determining whether or not the specified value defined above matches.
Using the verification data calculated from the data read from the external memory device (1) and the specified value specified by the microcomputer (2), the value obtained by subtracting the verification data from the specified value is discarded. Means (ST6) for detecting whether or not the information recorded in the external memory device (1) is destroyed,
Means (4) provided in the microcomputer (2) for reading the data of the backup unit (6) for storing the backup of the external memory device (1) and the data of the RAM unit (3) in the microcomputer (2). ST7)
Means (ST8) for comparing the data of the backup unit (6) with the data of the RAM unit (3);
Means (ST9-ST12) for writing the read information into the external memory device (1) by the encoder itself, and for self-recovering the information recorded in the external memory device (1);
A parameter destruction self-return device for an encoder device, comprising: In the encoder device (E) for detecting the amount of rotation of the rotating body and the amount of movement of the moving body,
A step (ST1) of reading data from an external memory device (1) for storing unique information or identification information for operating the encoder;
A step of temporarily storing data read from the external memory device (1) in a RAM unit (3) in a microcomputer (2) connected to an input / output unit of the external memory device (1) ( ST2)
A step of cumulatively adding the data read this time to the collation data to be subjected to data collation processing, and updating the result as collation data (ST3);
Determining whether all areas of the external memory device (1) have been read (ST4);
When the entire area of the external memory device (1) is read out, the accumulated collation data and a program unit (4) provided in the microcomputer (2) and necessary for the operation of the encoder A step (ST5) of determining whether or not the specified value specified above matches.
Using the verification data calculated from the data read from the external memory device (1) and the specified value specified by the microcomputer (2), the value obtained by subtracting the verification data from the specified value is discarded. A step (ST6) of detecting whether or not information recorded in the external memory device (1) is destroyed,
A step of reading data of a backup unit (6) provided in the microcomputer (2) and storing a backup of the external memory device (1) and data of a RAM unit (3) in the microcomputer (2) ( ST7)
A step of comparing the data of the backup unit (6) and the data of the RAM unit (3) (ST8);
Steps (ST9 to ST12) in which the read information is written in the external memory device (1) by the encoder itself, and the information recorded in the external memory device (1) is self-recovered;
A parameter destruction self-returning method for an encoder device, comprising:

Images